class_docstr: Base tokenizer class.
  Tokenizers implement tokenize, which should return a Tokens class.
code: def tokenize(self, text):
      raise NotImplementedError
  
imports: import copy
  import logging
  import regex
  import spacy
label_desc: Use image node_id 1 for calling the Tokenizer obj's underlying member method code with example usage: obj.tokenize(text) without return types